f(n)=(1/n+1)+(1/n+2)+.+(1/n+3),则f(k+1)=
2个回答
最后一项是(1/n+3)?
f(n)=(1/n+1)+(1/n+2)+.+(1/n+3)
=1/n+1+1/n+2+...1/n+3
=3/n+6
f(k+1)=3/(k+1)+6
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